docs: def edges_dump(self):
          """Dump the entire contents of the edges table."""
          self._flush_edges()
          for (
                  graph, orig, dest, idx, branch, turn, tick, extant
          ) in self.sql('edges_dump'):
              yield (
                  self.unpack(graph),
                  self.unpack(orig),
                  self.unpack(dest),
                  idx,
                  branch,
                  turn,
                  tick,
                  bool(extant)
              )